Innersole material and process of making the same.



H. BRUMMETT & W. H. COLBATH. INNERSOLE MATERlAL AND PROCESS OF MAKING THE SAME. APPLICATION FILED JULY 11. I916.

1,204,844. 4 Patented Nov. 14,1916.

Fig.1. 4

1 Fig.2.

Coding 0F waxy subsTunce Pqint I Cement comuining dsphu Pain PcunT Coding of waxy sub-siunce SheeT of compressed comm'mgled crude usphuh and Fibre \nv enters. Howard Brummefi WiHiumH Colbdth bYMWIW UNITED STATES PATENT OFFICE...

HOWARD BRUMMETT AND WILLIAM H. COLBATH, OE NATIGK, MASSACHUSETTS,

.ASSIGNORS OF ONE-THIRD T GEORGE A. SPEAK, OF MEDFORD, MASSACHU- SETTS. I

INNERSOLE MATERIAL PROCESS OF MAKING THE SAME. r

To all whom itmay concrn:

Be it known that we, HOWARD Bnmmrn'rr and WILLIAM H. COLBAT both citizens of the United States, residing at Natick, county of Middlesex, State of Massachusetts, have invented an Improvement in Innersole Materials and Processes of Making the Same,

of which the following description is a specification.

This invention relates to the composition of a new material in sheet form for use in inner soles for shoes and to the process of material which shall be tough, flexible, sweat and waterproof, which shall not be subject to decay or deterioration, which shall securely hold the thread, screws, nails or pegs employed in the manufacture of the shoes, and which shall produce a cheap and satisfactory inner sole.

The invention resides in a material in sheet form and in the process of making the same in which the main constituents are wool fiber and crude asphalt commingled when the asphalt is heated into liquid form and in which after the commingled fiber and asphalt have been reduced by pressure to sheet form the exterior surfaces of the material are coated with paint to give a finished coating of the required color, and

finally coated with a waxy substance.

The invention also resides in a. material of this character which is built up when required of a plurality of sheets of the said material cemented together by a cement having asphalt as its identifying constituent.

The nature of the invention will appear more fully from the accompanying description and drawings and it will be particularly defined in the claims.

- Specification of Letters Patent.

rammed Nov. 14, 1916.

Application filed July 11, 1916. Serial No. 108,725.

In the drawings Figure l is a perspective view of an inner sole embodying the invention; Fig. 2 is a detail enlarged of a portion of a cross-section of the material forming the inner sole and embodying one form of the invention.

In carrying out the invention and forming the material wool fiber and crude asphalt are employed as the main constituents. The

wool fiber may be such as usually consti tutes Waste material. Wool fiber is 'preferably employed but a certain proportion, say

up to about one-third of cotton fiber may be mixed with the wool fiber and has been found satisfactory.

The term fiber as hereafter used herein is therefore to be understood as comprising asphalt of commerce.

The first step in the process consists in commingling the fiber and the crude asphalt which is done by heating the asphalt to a sufiiciently liquid condition to enable the fiber to be thoroughly mixed therewith. This is accomplished by stirring or working the fiber into thehot' liquid asphalt. We have found that one part of asphalt to three and one-half parts of wool fiber by weight produces a suitable mixture, but this may be varied Within reasonable limits.

The next step in the process consists in forming the resultant mixture into sheet form by. subjecting it to pressure While warm. This may be carried out by passing the heavy viscous mixture between rolls until it is reduced to a thin sheet. If machines of sufiicient strength, and exerting suficient pressure are available the resulting sheet may be of the total thickness required for the inner sole material. If as more probable less powerful machines are available, the resultant sheet may be thinner so that the total thickness of the required sheet of inner sole material will be composed of or built up from, as hereinafter set forth,

- two or more of the thin sheets of material.

The next step of the process consists in drying the sheet material after it is reduced to sheet form. For this purpose the sheet material may be simplydeft standing at ordinary room temperature until it is dry and hard.

The next step of the process consists in coating both surfaces of the sheet material with paint. For this purpose ordinary commercial paint may be used and any required 'color may be employed.

In case the required thickness of sheet material is obtained by building up a plurality, that is, two or more thin sheets, then the next step inthe process consists in coating the surfaces to be juxtaposed of a plurallty of sheets of said material with a cement having as its essential constituent asphalt.

We have found that a very satisfactory cethe sheets to stand at room temperature until the cement is dry.

cement coated surfaces of a sufficient If the preceding two steps are employed then the next step in the process consists in heating the cement coated surfaces until the cement is rendered tacky or sticky.

If the preceding three steps in the process are employed then the next step consists in bringing into juxtaposition the tacky lurality of said sheets to total thickness of material.

If the preceding four steps of the process are employed then the next step inthe process consists in subjecting the juxtaposed sheets to pressure which may be done by passing them between pressure rollers.

In case the preceding five steps of the process are employed, thenthe next step in 6 the process consists in drying the built up sheet. This may be done by allowing it to stand at room. temperature until it 1s dry and hard.

The final step in the process in each case consists in finishing. the painted exterior surfaces of the sheet, whether of one thickness or resulting from buildin up two or more sheets, With a coating 0 waxy substance. is coating is for the purpose of keeping the finished sheets from adhering together, and it also acts to facilitate the passage of the needle in the stitching operation to clean give the requlred the needle and to wax the thread, and when screws and nails are used to assist in their passage into the material. For this coatlng we prefer to use parafiin or carnauba wax, but any similar waxy material may be em ployed.

Having fully described our invention, what we claim as new and desire to secure bv Letters Patent is:

1. The process of making sheet material for inner soles for shoes which consists in commingling fiber and hot liquid crude asphalt forming the resultant mixture into sheet form by subjecting it to pressure while hot, drying the sheet material, coating the exterior surfaces with paint, and coating the painted surfaces with a waxy substance.

2; The process of making sheet material for inner soles for shoes which consists in commingling fiber and hot liquid crude asphalt, forming the resultant mixture into sheet form by subjecting it to pressure while warm, drying the sheet material, coating both surfaces of said material with paint, coating the surfaces to be juxtaposed of a plurality of sheets of said material with a cement containing asphalt, drying the coated sheets, heating the cement coated surfaces until the cement is rendered tacky, bringing into juxtaposition the tacky cement .coated surfaces of a. suificient plurality of said sheets to give the required total thickness of materialpresenting painted surfaces at the exterior, subjecting the juxtaposed sheets to pressure and finishing the painted exterior surfaces of the resultant built up sheet with a coating of waxy substance.

3. The process of making sheet material for inner soles for shoes which consists in commingling fiber and hot liquid crude asphalt, forming the resultant mixture into sheet form by subjecting it, to pressure while warm, drying the sheet material,

coating the surfaces to be juxtaposed of 4. A sheet. material for inner soles for shoes composed of fiber and crude asphalt commingled and pressed into sheet form coated with paint and finished with a waxy coating.

5. A sheet material for inner soles for shoes composed of a plurality of juxtaposed compressed sheets of commingled fiber and crudeasphalt having their juxtaposed surfaces secured together by a cement containing asphalt, and having the exterior surfaces secured together by a cement containfaces coated-with paint and with an outer ing asphalt and with the exterior surfaces dressing of waxy substance. coated with paint.

1 6..A sheet material for er sales for In testimony whereof, we have signed our 5 shoes composed, of e lumlity ef juxtaposed names to this specification.

compressed sheets 0 'eongled fiber and HQWARD BR/IETT.

crude asphalt having their juxtepesfi sur- LIAM H. COLBATH. 

